Distribution of the Aftershock Sequence of the Latur Earthquake in Time and Space by Fractal Approach

Fractal dimensional analysis has been carried out on the aftershock sequence of the Latur earthquake (M_L 6.3) of September 30, 1993. Both the spatial and temporal correlation dimensions exhibit monofractal property. The spatial correlation dimension is found to be 1.75 indicating that the events tend to propagate in the whole region. The temporal correlation dimension is found to be 0.55 representing a non-continuous activity. The b-value obtained from the magnitude-frequency relation is found to be 0.56, which is typical of SCR seismicity. The focal depth-frequency analysis of the aftershocks showed that the lower boundary of the aftershock depth is about 7 km. The shallow depth of foci is a typical characteristic of the SCR seimicity. The fractal dimension obtained from the b-value is 1.12, which is close to 1, and reflects the 'stable state' of the system and confirms that the main event belongs to SCR. The frequency-time distribution analysis of the aftershocks indicated that the earthquake generation process is not random. The parameter 'p' of the modified Omori's formula for aftershock frequencies is estimated at 0.22.